1 files changed, 22 insertions, 20 deletions

diff --git a/database/engine/rrdengineapi.c b/database/engine/rrdengineapi.c
index bf373f31c..5fa23d8fd 100644
--- a/database/engine/rrdengineapi.c
+++ b/database/engine/rrdengineapi.c
@@ -4,7 +4,7 @@
 /* Default global database instance */
 static struct rrdengine_instance default_global_ctx;
 
-int default_rrdeng_page_cache_mb = RRDENG_MIN_PAGE_CACHE_SIZE_MB;
+int default_rrdeng_page_cache_mb = 32;
 int default_rrdeng_disk_quota_mb = RRDENG_MIN_DISK_SPACE_MB;
 
 /*
@@ -95,9 +95,8 @@ void rrdeng_store_metric_flush_current_page(RRDDIM *rd)
     if (likely(descr->page_length)) {
         int ret, page_is_empty;
 
-#ifdef NETDATA_INTERNAL_CHECKS
         rrd_stat_atomic_add(&ctx->stats.metric_API_producers, -1);
-#endif
+
         if (handle->prev_descr) {
             /* unpin old second page */
             pg_cache_put(ctx, handle->prev_descr);
@@ -185,16 +184,14 @@ void rrdeng_store_metric_next(RRDDIM *rd, usec_t point_in_time, storage_number n
     }
     page = descr->pg_cache_descr->page;
     page[descr->page_length / sizeof(number)] = number;
-    descr->end_time = point_in_time;
-    descr->page_length += sizeof(number);
+    pg_cache_atomic_set_pg_info(descr, point_in_time, descr->page_length + sizeof(number));
+
     if (perfect_page_alignment)
         rd->rrdset->rrddim_page_alignment = descr->page_length;
     if (unlikely(INVALID_TIME == descr->start_time)) {
         descr->start_time = point_in_time;
 
-#ifdef NETDATA_INTERNAL_CHECKS
         rrd_stat_atomic_add(&ctx->stats.metric_API_producers, 1);
-#endif
         pg_cache_insert(ctx, handle->page_index, descr);
     } else {
         pg_cache_add_new_metric_time(handle->page_index, descr);
@@ -312,8 +309,9 @@ unsigned rrdeng_variable_step_boundaries(RRDSET *st, time_t start_time, time_t e
         curr = &page_info_array[i];
         *pginfo_to_points(curr) = 0; /* initialize to invalid page */
         *pginfo_to_dt(curr) = 0; /* no known data collection interval yet */
-        if (unlikely(INVALID_TIME == curr->start_time || INVALID_TIME == curr->end_time)) {
-            info("Ignoring page with invalid timestamp.");
+        if (unlikely(INVALID_TIME == curr->start_time || INVALID_TIME == curr->end_time ||
+                     curr->end_time < curr->start_time)) {
+            info("Ignoring page with invalid timestamps.");
             prev = old_prev;
             continue;
         }
@@ -366,7 +364,7 @@ unsigned rrdeng_variable_step_boundaries(RRDSET *st, time_t start_time, time_t e
             continue;
         }
 
-        if (unlikely(0 == dt)) { /* unknown data collection interval */
+        if (unlikely(0 == *pginfo_to_dt(curr))) { /* unknown data collection interval */
             assert(1 == page_points);
 
             if (likely(NULL != prev)) { /* get interval from previous page */
@@ -454,7 +452,8 @@ storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle
     struct rrdeng_page_descr *descr;
     storage_number *page, ret;
     unsigned position, entries;
-    usec_t next_page_time, current_position_time;
+    usec_t next_page_time, current_position_time, page_end_time;
+    uint32_t page_length;
 
     handle = &rrdimm_handle->rrdeng;
     if (unlikely(INVALID_TIME == handle->next_page_time)) {
@@ -464,15 +463,17 @@ storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle
     if (unlikely(NULL == (descr = handle->descr))) {
         /* it's the first call */
         next_page_time = handle->next_page_time * USEC_PER_SEC;
+    } else {
+        pg_cache_atomic_get_pg_info(descr, &page_end_time, &page_length);
     }
     position = handle->position + 1;
 
     if (unlikely(NULL == descr ||
-                 position >= (descr->page_length / sizeof(storage_number)))) {
+                 position >= (page_length / sizeof(storage_number)))) {
         /* We need to get a new page */
         if (descr) {
             /* Drop old page's reference */
-            handle->next_page_time = (descr->end_time / USEC_PER_SEC) + 1;
+            handle->next_page_time = (page_end_time / USEC_PER_SEC) + 1;
             if (unlikely(handle->next_page_time > rrdimm_handle->end_time)) {
                 goto no_more_metrics;
             }
@@ -492,26 +493,27 @@ storage_number rrdeng_load_metric_next(struct rrddim_query_handle *rrdimm_handle
         rrd_stat_atomic_add(&ctx->stats.metric_API_consumers, 1);
 #endif
         handle->descr = descr;
+        pg_cache_atomic_get_pg_info(descr, &page_end_time, &page_length);
         if (unlikely(INVALID_TIME == descr->start_time ||
-                     INVALID_TIME == descr->end_time)) {
+                     INVALID_TIME == page_end_time)) {
             goto no_more_metrics;
         }
-        if (unlikely(descr->start_time != descr->end_time && next_page_time > descr->start_time)) {
+        if (unlikely(descr->start_time != page_end_time && next_page_time > descr->start_time)) {
             /* we're in the middle of the page somewhere */
-            entries = descr->page_length / sizeof(storage_number);
-            position = ((uint64_t)(next_page_time - descr->start_time)) * entries /
-                       (descr->end_time - descr->start_time + 1);
+            entries = page_length / sizeof(storage_number);
+            position = ((uint64_t)(next_page_time - descr->start_time)) * (entries - 1) /
+                       (page_end_time - descr->start_time);
         } else {
             position = 0;
         }
     }
     page = descr->pg_cache_descr->page;
     ret = page[position];
-    entries = descr->page_length / sizeof(storage_number);
+    entries = page_length / sizeof(storage_number);
     if (entries > 1) {
         usec_t dt;
 
-        dt = (descr->end_time - descr->start_time) / (entries - 1);
+        dt = (page_end_time - descr->start_time) / (entries - 1);
         current_position_time = descr->start_time + position * dt;
     } else {
         current_position_time = descr->start_time;